A thematic move that pops up in many lines, as the careful reader has already noticed. The idea is to give luft to the king and also prepare the rook lift with Rh3. White again should exercise patience before going after the e4-pawn. Black is ready to play with e6-e5 with good play.
14... f8f6  15. c1e3  15... c8d7 One of many possible moves. 16. f1g1 The best move. White shouldn't be in a hurry to capture on e4. 16... a8f8 The first new move in the game. Of course it's very natural to double rooks on the f-file, but it's probably even better to maneuver the knight immediately.